中文摘要：

对珠峰北坡绒布河谷地区大气观测实验发现，绒布河谷中地面气流存在明显的日变化，但有别于其它地区的山谷风系统：在凌晨至正午前后基本为〈2m·s^-1。的小风，而午后至午夜则盛行来自珠峰方向的偏南下山风。由于珠峰北坡地区地形复杂，绒布河谷中地面气流的日变化可能是山谷风、坡风与冰川风等环流系统共同作用的结果。为了分析绒布河谷中风场日变化的主要驱动因子，本文利用一个中尺度气象模式对绒布河谷中典型风场进行了模拟，并借助观测资料对模拟结果进行了检验，进而对风场的时空分布特征及其变化原因进行了探讨。

英文摘要：

Field campaigns in the Rongbuk valley on the northern slope of Mt. Qomolangma found that surface flows in the valley exhibit strong diurnal variations, but differ much from other valley wind systems： Valley winds are less than 2 m · s^-1 from early morning to noon, while strong southerlywinds from the direction of Mr. Qomolangma prevail from noon to mid-night. The distinctive feature of valley winds in the Rongbuk valley might be attributable to joint impacts of wind systems such as mountain-valley winds, katabatic winds and slope winds associated with complex topography and landuse on the northern slope of Mr. Qomolangma. In this paper a comprehensive mesoscale meteorological model is applied to simulate typical valley wind systems in the Rongbuk valley to investigate primary factors controlling the diurnal variations in surface valley winds, and model results are compared against in-situ observations.